Installed new cummins thermostat...
#11
My truck never did this untill I installed a new tstat from NAPA. Nothing was wrong with the old one but the seal was leakin so I figured as long as I had it apart I'd stick a new stat in it. Now I can watch the guage run up to 190 then drop down to about 140. Freaked me out at first but it dosn't go over 190 so I got used to it.
#14
#15
Mine only does it in the winter. If it's really cold, well below freezing, and I don't go off the highway, it will only do it once. Warm up to about 195 on the gauge, then the Tstat opens and it plunges to about 150 and stays there. If I'm doing mixed driving it's up and down like everyone else. If I let it idle too long in the winter it stops warming up and starts cooling off, eventually it cools off almost completely. My heat has never been good, it's only ever warm at best. New core, system is full. It's always been like this as far as I know, I've put over 200K on it, as far as I know the first 125K was no different. Just an old horse doin' what it's always done like these old horses did. I've heard rumors that they aren't all like this, but I've never had a mechanic under it who could find anything wrong
#16
#17
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